LAARS Mini-Therm JVS User Manual

Installation and Operation Instructions Document 1254B

Installation and Operation Instructions for

MINI-THERM

Residential Gas-Fired Hydronic Boilers Models JVH, JVS

Sizes 50-225

JVS

U.S. Patent No. 1,609,692 Canada Patent No. 383,318

JVH

These instructions are to be stored next to the boiler for reference purposes.

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,

qualied in hot water boiler installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in ue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty.

WARNING

If the information in this manual is not followed

exactly, a re or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other ammable

vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use

any phone in your building.

• Immediately call your gas supplier from a nearby phone. Follow the gas supplier's

instructions.

• If you cannot reach your gas supplier, call the re department.

Installation and service must be performed by

a qualied installer, service agency, or gas

supplier.

Vent damper is optional in some provinces of Canada..

AVERTISSEMENT Assurez-vous de bien suivres les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion

ou pour éviter tout dommage matériel, toute

blessure ou la mort.

Ne pas entreposer ni utiliser d’essence ni

d’autres vapeurs ou liquides inammables dans le voisinage de cet appareil ou de tout autre

appareil. QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

• Ne pas tenter d’allumer d’appareils.

• Ne touchez à aucun interrupteur. Ne pas vous servir des téléphones dansle bâtiment où vous êtes.

• Appelez immédiatement votre fournisseur de

gaz depuis un voisin. Suivez les instructions

du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par un installateur ou un service d’entretien

qualié ou par le fournisseur de gaz.

H2355800B

Page 2

LAARS Heating Systems

TABLE OF CONTENTS

SECTION 1. General Information

1A. Introduction ....................................................3

1B. Warranty ........................................................ 3

1C. Heater Identication .......................................4

SECTION 2. Boiler Assembly & Placement

2A. Field Assembly ..............................................4

2B. Boiler Placement ...........................................5

2C. Flooring ..........................................................5

2D. Dimensional Information ................................ 6

2E. Clearance / Closet Installations ..................... 8

SECTION 3.

Air and Venting

3A. Combustion Air Supply .................................. 9

3B. Venting .........................................................10

3C. Vertical Venting - Category I ........................ 11

3D-1 Horizontal Venting - Category III ..................12

3D-2 Venting Connections ....................................12

3D-3 Vent Terminations ........................................ 13

3E. Common Venting System ............................13

SECTION 6.

6A. Electrical Wiring ...........................................20

6B. Outdoor Reset .............................................20

SECTION 7.

7A. Filling the System ........................................25

SECTION 8.

Operating Procedures

8A. System Start-up ...........................................26

8B. Sequence of Operation ................................ 26

8C. Operating Instructions, JVH .........................27

8D. Operating Instructions, JVS ......................... 28

8E. Operating Temperature Control ...................29

SECTION 9.

9A. Maintenance ................................................ 31

9B. Electrical Troubleshooting ...........................32

SECTION 10. Replacement Parts

10A. Glossary of Terms ........................................35

10B. Parts List JVH ..............................................36

10C. Parts List JVS ..............................................38

SECTION 4. Gas Connections

4A. Gas Supply and Piping ................................ 13

4B. Special Precautions for LP .........................15

SECTION 5. Water Connections

5A. Water Piping ................................................ 15

5B. By-pass Piping ............................................. 17

5C. Adjusting the bypass ...................................17

5D. Alternate Auto-Bypass Operation ................17

5E. Flow Requirements ...................................... 18

5F. Chilled Water Systems ................................18

5G. Oxygen Permeable Systems ....................... 18

5H. Anti-Freeze ..................................................18

Mini-Therm JV

SECTION 1. General Information

1A. Introduction

This manual provides information necessary for the

installation, operation, and maintenance of the Laars Model JV low pressure, copper tube hydronic boilers.

These boilers are available in two congurations; the JVH has a hot surface pilot ignition system and the JVS has an electronic intermittent ignition device (I.I.D.). Look for the model designation on the rating

plate, which can be found on top of the boiler. All application and installation procedures should

be reviewed completely before proceeding with

the installation. Consult the Laars factory, or local factory representative, with any problems or questions

regarding this equipment. Experience has shown that most operating problems are caused by improper

installation.

WARNING

This hydronic boiler must be installed in

accordance with the procedures detailed in this

manual, or the Laars warranty will be voided. The

installation must conform to the requirements of

the local jurisdiction having authority, and, in the

United States, to the latest edition of the National

Fuel Gas Code, ANSI Z223.1. In Canada, the

installation must conform with the latest edition of

CAN/CGA B149.1 OR .2 installation codes for gas

burning appliances, and/or local codes.

Any modications to the boiler, its gas controls,

gas orices, wiring or draft inducer assembly may void the warranty. If eld conditions require modications, consult the factory representative

before initiating such modications.

Page 3

1B. Warranty

The Laars Model JV boilers are covered by a limited

warranty. The owner should ll out the warranty registration card and return it to Laars.

All warranty claims must be made to an authorized Laars representative or directly to the factory. Claims must include the boiler serial number and model (this information can be found on the

rating plate), installation date, and name of the installer. Shipping costs are not included in the warranty coverage.

Some accessory items are shipped in separate

packages. Verify receipt of all packages listed on the packing slip. Inspect everything for damage

immediately upon delivery, and advise the carrier of

any shortages or damage. Any such claims should be led with the carrier. The carrier, not the shipper, is responsible for shortages and damage to the shipment

whether visible or concealed.

The warranty does not cover damage caused by improper assembly installation, operation or eld modication.

ATTENTION

L' eau chaude chaudière doit être installé en

conformité avec les procédures détaillées dans

ce manuel, ou le Laars garantie sera annulée. L'installation doit être conforme aux exigences

de la juridiction locale ayant l'autorité, et, aux ÉTATS-UNIS , à la dernière édition du National gaz carburant Code, ANSI Z223.1. Au Canada,

l'installation doit être conforme à la plus récente édition de la norme CAN/CGA B149.1 ou .2 codes d'installation gaz pour appareils de combustion et/

ou codes locaux.

Page 4

1C. Heater Identication

Consult the rating plate on the boiler. The following example simplies the heater identication:

1 2 3 4 5 6 7 8 9 10 11 12

VJ U 2

LAARS Heating Systems

MODEL

J V

IGNIT SYST

S H

Table 1. Boiler Model Identication.

SIZE

0 5 0 0 7 5 1 0 0 1 2 5 1 6 0 2 2 5

FUEL

N P

FIRING

SYST

JVH

1st and 2nd CharaCters (series name) JV = mini-therm 3rd CharaCter (ignition system) h = hot surfaCe pilot 4th thru 6th CharaCters (size) input mBtu / h 7th CharaCter (fuel) n = natural gas p = propane gas 8th CharaCter (firing system) C = on / off 9th CharaCter (ConstruCtion option) s = standard 10th CharaCter (altitude in feet) s = (0 - 2,000) natural or (0 - 5,000) propane i = (5,001 - 8,000) natural and propane J = (8,001 - 10,000 natural and propane 11th CharaCter (Country) u = usa & Canada 12th CharaCter (reVision) 2 = seCond reVision

CONST

OPTION

C D

S P

ALTITUDE

COUNTRY

REVISION

JVS

1st and 2nd CharaCters (series name) JV = mini-therm 3rd CharaCter (ignition system) s = spark ignition 4th thru 6th CharaCters (size) input mBtu / h 7th CharaCter (fuel) n = natural gas p = propane gas 8th CharaCter (firing system) D = on / off 9th CharaCter (ConstruCtion option) i = (standard) J = pump (050-125 only) 10th CharaCter (altitude in feet) s = (0 - 2,000) natural or (0 - 5,000) propane i = (5,001 - 8,000) natural and propane J = (8,001 - 10,000 natural and propane 11th CharaCter (Country) u = usa & Canada 12th CharaCter (reVision) 2 = seCond reVision

SECTION 2.

Boiler Assembly and Placement

2A. Field Assembly

These boilers are available in two congurations; the JVH has a hot surface ignition pilot and integral draft fan, and the JVS has an electronic intermittent ignition device (I.I.D.). Look for the model designation on the rating plate, which can be found on top of the boiler in the right rear corner.

The Laars automatic vent dampers are standard on all JVS models. The Laars side wall power venters can be used on JVS models. Special instructions for their installation are included in the vent damper and

power venter package. Read them carefully before

installation.

Mini-Therm JV

Vent Damper (JVS only):

1. Mini-Therm JVS boilers have built-in draft diverter for natural draft operation.

2. Find the vent damper box which is located in the boiler package.

3. Install the vent damper directly to the top of the draft diverter outlet with the damper operator

facing to the front of the boiler, and with the ow direction arrow pointing upward. Use the vent

damper wire harness provided with the boiler to connect the vent damper to the boiler. The bracket end of the harness should be connected to the vent damper actuator.

4. For Model JVS only: Install the metal plug

provided with the vent damper onto the damper plate hole.

5. Do not modify the automatic vent damper device. It is very important that no other vents are closed.

Provide at least six inches clearance between

the automatic vent damper and combustible construction, and be sure to allow access for

servicing the damper.

Temperature/Pressure Gauge: Install the temp/

pressure gauge provided in the parts box.

Page 5

2C. Flooring

JVS model boilers can only be installed on

noncombustible ooring.

JVH model boilers are designed and certied for installation on a combustible oor.

All boilers must be installed on a level oor and

must NEVER be installed on carpeting. NEVER store objects on or around the boiler.

Noncombustible ooring is dened as ooring material and surface nish not capable of being ignited and burning and with no combustible materials against the underside. Acceptable materials are those consisting entirely of a combination of steel, iron, brick, tile, concrete, slate, glass or plaster.

The JVS model boilers can be installed on a

combustible oor if a noncombustible base

assembly, available from Laars, is used. See the JVS Parts List at the back of this manual for the appropriate Noncombustible Base Kit part number.

2B. Boiler Placement

1. The boiler must be placed to provide clearances

on all sides for maintenance and inspection. There must also be minimum distances maintained from combustible surfaces. Avoid locations which can

be damaged by water or moisture.

2. A minimum of 15" (381mm) access must be

available in front of the boiler for burner tray removal. Consult local codes for clearances to hot water pipes and accessories.

3. If the boiler is to be installed in a garage, all

burners and burner ignition devices must have a minimum 18" (457mm) clearance

above the oor.

4. Boilers can be installed in a closet as long as

the minimum clearances shown in Table 2 are observed. Special attention should be paid to clearances between the front of the boiler and the closet door when it is closed (see Figure 2).

WARNING

This boiler is intended for indoor installation only.

Do not install this boiler in a location subject to

negative pressure, or improper operation will occur.

Avertissement

Cette chaudière est destiné pour une installation

intérieure uniquement. Ne pas installer cette

chaudière dans un endroit soumis à pression

négative, ou fonctionnement incorrect se produira

Figure 1. Typical Combustible Floor Installation.

As an alternative to the Laars Noncombustible Base

Kit, in the United States the National Fuel Gas

Code allows a heater to be placed on a combustible surface when there is a platform under the heater made of hollow masonry no less than 4 inches (102 millimeters [mm]) thick, covered with sheet metal at

least 24 gauge thick and extending beyond the full

Caution

Do not force motor operation when operator is

fastened to the damper by moving the damper

blade, turning the shaft or by turning the position

indicator.

Attention

Ne pas tourner le registre manuellement avec

ou sans courant électrique ou le moteur sera

endommagé.

Page 6

Size A B C

Wate r

Connection

Gas

Connection

in.

75 100 125 160 225

13-3/8 13-3/8 16-7/8 16-7/8 20-3/8 25-5/8

340 340 429

429 518 651

3-1/8 2-1/4 5-3/4 5-1/2 7-1/4

57 146 140 184

254

2-7/8

2 2 2

73 51 73 51 51 51

1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4

1/2 1/2 1/2 1/2 1/2

3/4

JVH

2D. JVH Dimensional Information

LAARS Heating Systems

Dimensions in

inches

C B

180

152

2.4

635

JVH Dimensions

610

152

180

C B

635

2.4

610

Mini-Therm JV

JVS

Page 7

2D. JVS Dimensional Information

Dimensions in

inches

180

9 -1/4

240

Water

Size A B C D E V

in. mm in. mm in. mm in. mm in. mm in. mm 1-1/4 1/2 50 13-3/8 340 27-3/4 710 23-5/8 600 21-3/4 550 26-1/2 670 4 10 1-1/4 1/2 75 13-3/8 340 27-3/4 710 24-1/8 610 21-3/4 550 27-1/2 700 5 13 1-1/4 1/2

100 16-7/8 430 28-3/4 730 24-1/8 610 22-3/4 580 27-1/2 700 5 13 1-1/4 1/2 125 16-7/8 430 28-3/4 730 23-5/8 600 22-3/4 580 27-1/2 700 6 15 1-1/4 1/2 160 20-3/8 518 28-3/4 730 23-5/8 600 22-3/4 580 27-1/2 700 6 15 1-1/4 1/2 225 25-5/8 651 31-1/2 800 23-1/4 590 23-3/4 630 27-1/2 700 7 18 1-1/4 3/4

Conn

JVS Dimensions

Gas

Conn

Page 8

width and depth of the heater by at least 12 inches (305mm) in all directions. The masonry must be laid with ends unsealed, and joints matched to provide

free circulation of air from side to side through the masonry (see Figure 1). If the boiler is installed in a carpeted alcove, the entire oor of the alcove must be

covered by a noncombustible platform.

2E. Clearance / Closet Installations

All Mini-Therm JV's can be installed in a closet as

long as the minimum clearances are observed. See Table 2JVH and Figure 2JVH for clearances required for the Mini-Therm JVH. See Table 2JVS and Figure 2JVS for clearances required for the Mini-Therm JVS

LAARS Heating Systems

Special attention should be paid to clearances between the front of the boiler and the closet door when it is closed.

Consult the American National Standard Z21.13 for

more information concerning closet installations. In

Canada, refer to the latest edition of CSA-B149.1.

Boiler Sizes 50 - 225 Clearances in cm Left side 2 5 Right side 5 15 Rear 2 5 Front 4 10 Flue (using B-vent) 6 15 Top 23 58

Boiler Sizes 50 - 125 160 - 225 Clearances in cm in cm

Left side 6 15 6 15

Right side 6 15 6 15 Rear 6 15 6 15 Front 4 10 4 10 Flue 6 15 6 15 Top 23 58 36 91

Table 2JVS Minimum Boiler ClearancesTable 2JVH Minimum Boiler Clearances

Note: Clearances listed are manufacturer’s tested values. These are given as minimum values. Where local and national

codes apply, and values are different than those listed use the greater value to ensure safe operation.

Minimum Boiler Clearances from Combustible Surfaces.

Dégagements Minimaux à Assurer Entre Ics Parois de L’appareil et leo Constructions Combustibles

(51)

TOP

VIEW

(127)

(152)

6 15

(152)

MIN

Air

Openings

Figure 2JVH. Closet Installation.

SIDE

VIEW

Dimensions in

inches (mm).

Dimensions in inches cm.

*6" for models JV160 to JV225.

Figure 2JVS. Closet Installation

Mini-Therm JV

Boiler Size Outside Air Area Inside Air Area

sq. in

sq. cm

sq. in.

sq. cm

100

645

129

100

645

100

161

100

645

125

206

125

807

160

258

160

1032

225

387

225

1452

*Area indicated is for one of two openings: one at floor level and one at the ceiling, so the total net free area would be double the figures shown. For special conditions, refer to

NFPA54 ANSI Z223.1. In Canada, refer to the National

Standard CAN1-B149.1 or .2, which differs from this table. NOTE: Check with louver manufacturers for Net Free Area of Louvers. Correct for screen resistance to the Net Free Area if a

screen is used.

SECTION 3.

Air and Venting

3A. Combustion Air Supply

The boiler location must provide sufcient air

supply for proper combustion, and ventilation of

the surrounding area as outlined in the latest edition of U.S. ANSI standard Z223.1 or in Canada, CAN/ CGA-B149.1 or .2, and any local codes that may be

applicable.

In general, these requirements specify that the boiler rooms which represent conned spaces should be provided with two permanent air supply openings; one within 12 inches (305mm) of the ceiling, the other within 12 inches (305mm) of the oor.

Page 9

NOTE: In Canada, follow Canadian Standard,

CAN/CGA-B149 or local codes.

Outside Air Supply: When combustion air is

supplied directly through an outside wall, each opening should have a minimum free area of one square inch per 4,000 BTU/h (6 sq. cm per 1.2 kW) input of the total input rating of all appliances in the

enclosed area.

Inside Air Supply: When combustion is supplied

from inside the building, each opening should have

a minimum free area of one square inch per 1,000

BTU/h (6 sq. cm per 0.3 kW) input of the total input rating of all appliances in the enclosed area. These openings should never be less than 100 square inches (645 sq. cm).

CHIMNEY

Table 3. Minimum Recommended

Air Supply to Boiler Room

Exhaust Fans or Vents: Any equipment which exhausts air from the boiler room can deplete the

combustion air supply or reverse the natural draft

action of venting system. This could cause ue

products to accumulate in the boiler room. Additional

air must be supplied to compensate for such exhaust.

The information in Table 3 is not applicable in

installations where exhaust fans or blowers of any type are used. Such installations must be designed by qualied engineers.

If a blower or fan is used to supply air to the boiler room, the installer should make sure it does not create drafts which could cause nuisance shutdowns. If a blower is necessary to provide adequate combustion air to the boiler, a suitable switch or equivalent must

CHIMNEY

LINER

Figure 3. Chimney Venting. Figure 4. Vertical Venting.

THIMBLE

CLEANOUT

PER FT.

(20mm PER M)

SLOPE

SYSTEM

1/4"

VENT

BOILER

LINER

THIMBLE

CLEANOUT

1/4"

PER FT.

(20mm PER M)

SLOPE

VENT

SYSTEM

12" (305mm)

BOILER

Page 10

10 (3.0) OR

LESS

LAARS Heating Systems

MORE THAN 10

(3.0)

2 (0.6) MIN.

WALL OR PARAPET

CHIMNEY

10 (3.0)

OR LESS

2 (0.6)

RIDGE

Figure 5. Vertical Vent Termination.

MIN.

CHIMNEY

3 (0.9)

MIN.

TERMINATION

10 FT. (3.0m)

OR LESS FROM RIDGE,

WALL OR PARAPET

3 (0.9)

MIN.

Dimensions in feet (m).

be wired into the boiler control circuit to prevent the

boiler from ring unless the blower is operating.

The boiler must be completely isolated and protected from any source of corrosive chemical fumes such as those emitted by trichloroethylene, perchloroethylene, chlorine, etc.

3B. Venting

3 (0.9)

MIN.

WALL OR PARAPET

NOTE: NO HEIGHT ABOVE PARAPET REQUIRED WHEN FROM WALLS OR PARAPET IS MORE THAN 10 FT. (3.0m)

CHIMNEY

RIDGE

MORE THAN 10

(3.0)

2 (0.6)

MIN.

CHIMNEY

10 (3.0)

3 (0.9)

MIN.

The boiler vent collar must be fastened directly to an unobstructed vent pipe with rustproof sheet metal

screws no longer than 1/2” (13mm) and located to

prevent interference with the inducer damper. Do not weld the vent pipe to the boiler collar. The

weight of the stack must not rest on the boiler. The

boiler top must be easily removable for normal boiler service and inspection.

Vent Categories: Mini-Therm JVS is a natural draft

appliance for Category I venting only. JVH is a

fan-assisted product that can be vented vertically in a

properly-designed Category I system, or can be vented horizontally as a Category III appliance, per this

installation manual.

WARNING

This boiler must be vented in accordance with

Part 7, Venting of Equipment, of the latest edition

of the National Fuel Gas code, ANSI Z223.1 and

all applicable local building codes. In Canada,

follow CAN/CGA B149 Installation codes.

Improper venting of this appliance can result in

excessive levels of carbon monoxide which can

result in severe personal injury or death!

AVERTISSEMENT

Cette chaudière doit être ventilé, conformément

aux dispositions de la partie 7, de la ventilation de

l'équipement, de la dernière édition du National

gaz carburant code, ANSI Z223.1 et tous les codes du bâtiment locaux. Au Canada, CAN/

CGA B149 codes d'installation. Une mauvaise

ventilation de cet appareil peut entraîner des

niveaux excessifs de monoxyde de carbone qui

peut entraîner de graves blessures ou la mort!

IMPORTANT

Only JVH (induced draft) models may be side-wall

vented per Section 3D without the addition of a

properly sized and installed power venter.

JVS must be connected only using Category Type

I methods and materials per Section 3C. JVH may be connected per Category I or III (See Section 3D) methods and materials. See fuel gas code for more

information regarding your venting application.

IMPORTANT

Seulement JVH (induits projet) modèles peut être

paroi ventilé par chapitre 3D sans l'addition de la

bonne taille et de puissance installée venter. JVS

doivent être connectés uniquement en utilisant Type de catégorie I méthodes et matériaux par

Section 3C. JVH peut être connecté par catégorie

I ou III (voir section 3D) Les méthodes et les

matériaux. Voir gaz combustible code pour plus

d'informations concernant votre application

d'aération.

Avoid terminating boiler vents near air conditioning or air supply fans. The fans can pick up exhaust ue products from the boiler and return them to the building, creating a possible health hazard. Avoid oversized vent pipe or extremely long runs

Mini-Therm JV

Page 11

of the pipe, which may cause excessive cooling and

condensation.

3C. Vertical Venting - Category I

(JVS and JVH)

All venting must comply with fuel gas code and be installed by a licensed professional.

The Mini-Therm JVS or JVH series boiler can

be vented into a masonry chimney, (see Figure 2) provided several conditions are met:

1. The chimney must have an appropriate tile lining

that is clean, properly constructed and properly sized.

2. The chimney passage way shall be examined to

ascertain that it is clear and free of obstructions.

WARNING

Do not store any chemical, cleaners, or other

corrosive material near combustion air openings

or in the room. Avoid locating dryer vents in the

vicinity of combustion air openings. Failure to

prevent corrosive materials from mixing with

combustion air can result in reduced boiler life

and unsafe boiler operation.

AVERTISSEMENT

N’entrepposer aucun produit chimique, produit

nettoyant ou produit corrosif à proximité des

bouches d’air de combustion ou dans la pièce.

Éviter de placer des tuyaux de ventilation pour

sécheuse à proximité des bouches d’air de

combustion. Le fait de laisser des maitières corrosives se mélanger à l’air de combustion risque de réduire le cycle de vie de l’appareil

de chauffage et de compromettre son

fonctionnement.

3. If a chimney rebuild is required, it shall conform

to nationally recognized standards (see National Building Code or ANSI/NFPA 211).

4. The boiler must not be connected to a replace, wood stove or other solid fuel burning

equipment.

5. When the boiler and a hot water heater are to be connected to the same chimney, they must have their own vent connector and enter the chimney

at least 6” (152mm) apart.

IMPORTANT NOTE: Always provide a minimum clearance of 6” (152mm) between Type C (single wall)

vent pipe and any combustible materials.

WARNING

Single wall vent pipe must NEVER pass through

interior walls or through oors or ceilings! Failure

to comply with this warning could result in a re

causing property damage, personal injury, or death!

AVERTISSEMENT

Paroi simple tuyau d'évent doit jamais passer par

l'intérieur les murs ou par planchers ou plafonds

! Le non-respect de cet avertissement peut

provoquer un incendie causant des dommages

matériels ou corporels, ou de mort!

When installing the vent system, all applicable

national and local codes must be followed! The use

of thimbles, restops and other protective devices, when penetrating combustible or noncombustible

construction, must be in accordance with all applicable national and local codes.

VENT TERMINAL

4 (1.2)

MIN.

VENT

TERMINAL

Dimensions in

feet (m).

Figure 6. Horizontal Vent Termination.

4 (1.2)

MIN.

12 (3.7)

MIN.

3 (0.9)

MIN.

VENT TERMINAL

LESS THAN

(3.0)

FORCED

AIR INLET

6 (1.8) MIN.

GRADE

CAULK JOINTS

ANCHORED

FASTENER

THIMBLE

SHEET METAL

SCREWS

SEAL ENTIRE

CIRCUMFERENCE

OF JOINT

CAULK JOINTS

ANCHORED

FASTENER

EXHAUST

HOOD

VENT TERMINAL DETAIL

Page 12

Si ze

Diameter

No. of

Elbows

Horizontal Run Length

in.

ft.

50 - 160

102

10.7

225

102

3.0

225

152

10.7

LAARS Heating Systems

Vertical vents of the induced draft JVH boilers must be installed in accordance with the code requirement

for Category 1, Fan Assisted Appliances. Follow the

requirements as indicated in the latest edition of ANSI

Z223.1/NFPA 54, sizing of Category I Venting System and Appendix G, or in Canada, follow the instruction of CAN/CGA-B149 installation code.

An unused lined chimney can be used as a raceway

for single wall vent pipe, (see Figure 3). Never run vent pipe through a ue that has another appliance

attached to it.

3D-1. Horizontal Venting - Category III

(JVH only)

When venting is horizontal, or cannot meet the requirements of Category I, it can develop positive

pressure and must be installed in accordance with

this section and the specic vent manufacturer’s instructions. Common venting is not allowed in Category III systems.

BOILER VENTING

DETAIL

OUTSIDE WALL

VENT

SYSTEM

THIMBLE

BOILER

VENT TERMINAL

HOOD

Figure 7. Horizontal Venting.

SHEET METAL

SCREWS

12" (305mm)

MIN.

CAULK ENTIRE

JOINT, INCLUDING

THE SCREWS

*WHEN HORIZONTAL RUN

EXCEEDS 5 FT. (1.5m)

For best results, horizontal vent systems should

be as short and straight as possible. Material of vent connectors shall be as follows:

Description Manufacturer Product

High Temperature

RTV

2" (51mm) wide

Aluminum foil tape

- adhesively backed

Dow Corning Trade Mate

Venture

Product

#3243

2" (51mm) wide

Aluminum foil tape

3M Product #433

- adhesively backed

Vent Sealing Materials.

Materials Vent Length

In U.S.A.: UL type 304, 316 or 294-C

stainless steel or equal 26 gauge minimum. In Canada: Use "BH-Type" vent material certied to ULD-S636 Class I (more than 135°C, but not more than 245°C

ue gas temperature), made of AL29-4C stainless steel or equal.

Do not use plastic venting of any kind.

Up to a maximum

of 55' (17m) of

equivalent pipe run (including required

elbows).

The boiler vent collar must be fastened to the vent

pipe with rustproof metal screws no longer than 1/2” (13mm) and sealed with high temperature (500ºF / 260ºC) silicone sealant. For larger diameter vent pipes,

use a sealed reducer fastened directly to the boiler collar and seal all joints as indicated in Figure 7.

Allow the sealant to cure for 24 hours before operating

the boiler. The entire vent system must not exceed the size

specied in Table 4. The following criteria must be observed:

1. Attach a vertical pipe at least 12” (305mm) high

to the boiler outlet before the horizontal run if

run exceeds 5 feet (see Figure 5).

2. Support the vent run at 3’ (.9m) intervals with overhead hangers.

3D-2. Vent Connections (JVH only)

The vent system must be gas tight. All seams and joints must be sealed with silicone sealant or adhesive

tape having a minimum temperature rating of 400°F

(204ºC). Use at least three corrosion resistant screws at each slip joint, when required.

For each elbow eliminated, add 5’ (1.5m) of allowable vent.

Table 4. Horizontal Venting Conguration.

3. Pitch down the vent run, toward the vent terminal

(hood), 1/4” per foot (20mm per meter).

4. Do not locate any joint screws at the bottom of the vent run.

3D-3. Vent Termination (JVH only)

The side wall vent terminal (hood), Laars Part

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